WO2017047757A1 - Système optique à puissance variable, dispositif optique, dispositif d'imagerie, et procédé de production d'un système optique à puissance variable - Google Patents

Système optique à puissance variable, dispositif optique, dispositif d'imagerie, et procédé de production d'un système optique à puissance variable Download PDF

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Publication number
WO2017047757A1
WO2017047757A1 PCT/JP2016/077469 JP2016077469W WO2017047757A1 WO 2017047757 A1 WO2017047757 A1 WO 2017047757A1 JP 2016077469 W JP2016077469 W JP 2016077469W WO 2017047757 A1 WO2017047757 A1 WO 2017047757A1
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Prior art keywords
group
lens
optical system
focusing
variable magnification
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PCT/JP2016/077469
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English (en)
Japanese (ja)
Inventor
幸介 町田
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株式会社ニコン
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Application filed by 株式会社ニコン filed Critical 株式会社ニコン
Priority to JP2017540006A priority Critical patent/JP6705459B2/ja
Priority to CN201680060992.4A priority patent/CN108139574B/zh
Priority to EP16846628.2A priority patent/EP3351987A4/fr
Priority to US15/759,829 priority patent/US10725272B2/en
Publication of WO2017047757A1 publication Critical patent/WO2017047757A1/fr
Priority to US16/900,321 priority patent/US11448860B2/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
    • G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-++-
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length

Definitions

  • the present invention relates to a variable magnification optical system, an optical device, an imaging device, and a method for manufacturing the variable magnification optical system.
  • variable magnification optical systems suitable for photographic cameras, electronic still cameras, video cameras, etc.
  • the variable power optical system as disclosed in Japanese Patent Laid-Open No. 4-293007 has not been sufficiently reduced in weight of the focusing group, and is unsuitable for speeding up the focusing operation.
  • the first aspect of the present invention is: A first lens group having a positive refractive power disposed on the most object side; An intermediate group having a negative refractive power and disposed closer to the image side than the first lens group; A focusing group which has a positive refractive power and which moves at the time of focusing, which is arranged on the image side from the intermediate group; An image side group having a positive refractive power disposed on the image side from the focusing group, During zooming, the distance between the first lens group and the intermediate group, the distance between the intermediate group and the focusing group, and the distance between the focusing group and the image side group change,
  • the image side group includes, in order from the object side, a group A having positive refractive power, a group B having negative refractive power that satisfies the following conditional expression with respect to the group A, and a group C: A variable magnification optical system comprising: 1.67 ⁇ fA / ( ⁇ fB) ⁇ 2.80 However, fA: focal length
  • the second aspect of the present invention includes A first lens group having a positive refractive power disposed on the most object side; An intermediate group having a negative refractive power and disposed closer to the image side than the first lens group; A focusing group which has a positive refractive power and which moves at the time of focusing, which is arranged on the image side from the intermediate group; An image side group having a positive refractive power disposed on the image side from the focusing group, Arrangement is made so that the distance between the first lens group and the intermediate group, the distance between the intermediate group and the focusing group, and the distance between the focusing group and the image side group change during zooming.
  • the image side group includes, in order from the object side, a group A having positive refractive power, a group B having negative refractive power that satisfies the following conditional expression with respect to the group A, and a group C: A variable magnification optical system manufacturing method is provided. 1.67 ⁇ fA / ( ⁇ fB) ⁇ 2.80 However, fA: focal length of the A group fB: focal length of the B group
  • FIG. 5 is a diagram illustrating various aberrations of the variable magnification optical system according to the first example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the first example.
  • FIG. 5 is a diagram illustrating various aberrations of the variable magnification optical system according to the first example. It is sectional drawing of the variable magnification optical system which concerns on 2nd Example.
  • FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the second example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the second example.
  • FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the second example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the second example.
  • FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the second example. It is sectional drawing of the variable magnification optical system which concerns on 3rd Example.
  • FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the third example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the third example.
  • FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the third example. It is sectional drawing of the variable magnification optical system which concerns on 4th Example.
  • FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fourth example.
  • FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fourth example. It is sectional drawing of the variable magnification optical system which concerns on 5th Example.
  • FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fifth example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the fifth example.
  • FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fifth example. It is sectional drawing of the variable magnification optical system which concerns on 6th Example.
  • FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fourth example. It is sectional drawing of the variable magnification optical system which concerns on 6th Example.
  • FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the sixth example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the sixth example.
  • FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the sixth example. It is sectional drawing of the variable magnification optical system which concerns on a 7th Example.
  • FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the seventh example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the seventh example.
  • FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the seventh example.
  • FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to the eighth example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the eighth example.
  • FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to the eighth example. It is a figure which shows the structure of the camera provided with the variable magnification optical system. It is a figure which shows the outline of the manufacturing method of a variable magnification optical system.
  • variable magnification optical system of the present embodiment includes a first lens group having a positive refractive power disposed closest to the object side, and an intermediate group having a negative refractive power disposed closer to the image side than the first lens group.
  • the side group includes a group A having positive refractive power, a group B having negative refractive power that satisfies the following conditional expression (1) with respect to the group A, and a group C: It consists of a group. (1) 1.67 ⁇ fA / ( ⁇ fB) ⁇ 2.80
  • fA focal length of the A group
  • fB focal length of the B group
  • the focusing group is composed of one or two lens components.
  • the B-group is movably arranged so as to include a displacement component in a direction perpendicular to the optical axis.
  • the focusing group of the present embodiment has at least one lens group.
  • the image side group of the present embodiment has at least one lens group.
  • the A group, the B group, and the C group of the present embodiment each have at least one lens.
  • the lens group refers to a portion having at least one lens separated by an air interval that changes during zooming.
  • the distance between the lenses included in the lens group does not change at the time of zooming, but can be changed as appropriate.
  • the zoom optical system of the present embodiment has at least four lens groups, and the distance between the lens groups changes during zooming. With this configuration, various aberrations can be corrected well during zooming.
  • the focusing group is composed of one or two lens components.
  • the lens component refers to a single lens or a cemented lens.
  • the focusing group refers to a portion having at least one lens separated by an air interval that changes during focusing.
  • the image side group includes, in order from the object side, the A group having positive refractive power, the B group having negative refractive power, and the C group. The B group moves as a vibration proof group so as to include a displacement component in a direction perpendicular to the optical axis.
  • the anti-vibration group refers to a portion that moves so as to have a component perpendicular to the optical axis during anti-vibration.
  • Conditional expression (1) defines the ratio between the focal length of the A group and the focal length of the B group that is the image stabilizing group.
  • the variable magnification optical system of the present embodiment can effectively suppress deterioration of optical performance during image stabilization by satisfying conditional expression (1).
  • conditional expression (1) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the image stabilizing group increases, and the decentration coma aberration during the image stabilizing increases.
  • conditional expression (1) of the variable magnification optical system of the present embodiment when the corresponding value of conditional expression (1) of the variable magnification optical system of the present embodiment is below the lower limit value, the refractive power of the A group becomes large, and it is difficult to correct various aberrations including spherical aberration. Become.
  • the refractive power of the anti-vibration group decreases, and the amount of movement of the anti-vibration group during vibration isolation increases. For this reason, since the lens barrel which accommodates the variable magnification optical system of this embodiment will enlarge, it is unpreferable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 1.68.
  • conditional expression (1) it is preferable to set the lower limit of conditional expression (1) to 1.69.
  • the distance between the A group and the B group is larger than the distance between the B group and the C group.
  • the variable magnification optical system of the present embodiment satisfies the following conditional expression (1A).
  • (1A) 2.50 ⁇ f1 / ( ⁇ fc) ⁇ 6.20
  • f1 Focal length of the first lens group
  • fc Focal length of the intermediate group
  • the conditional expression (1A) defines a ratio between the focal length of the first lens group and the focal length of the intermediate group.
  • the zoom optical system according to the present embodiment satisfies the conditional expression (1A), and thus can suppress variations in various aberrations including spherical aberration when zooming from the wide-angle end state to the telephoto end state. If the corresponding value of conditional expression (1A) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the intermediate group increases, and it becomes difficult to correct various aberrations including spherical aberration. End up.
  • conditional expression (1A) of the variable magnification optical system of the present embodiment satisfies the following conditional expression (1B).
  • conditional expression (1B) 3.00 ⁇ f1fw / ff ⁇ 9.00
  • f1fw the combined focal length from the first lens group to the in-focus group in the wide-angle end state
  • ff the focal length of the in-focus group
  • the conditional expression (1B) satisfies the conditional expression (1B) from the first lens group in the wide-angle end state to the in-focus group This defines the ratio of the combined focal length up to and the focal length of the in-focus group.
  • the variable magnification optical system of the present embodiment suppresses fluctuations in various aberrations including spherical aberration when focusing from an infinite object to a close object in the wide-angle end state by satisfying conditional expression (1B). Can do.
  • conditional expression (1B) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the focusing group increases, and when focusing from an infinite object to a close object in the wide-angle end state, It becomes difficult to suppress fluctuations in various aberrations including spherical aberration.
  • conditional expression (1B) of the variable magnification optical system of the present embodiment when the corresponding value of conditional expression (1B) of the variable magnification optical system of the present embodiment is below the lower limit value, the refractive power from the first lens group to the focusing group becomes large in the wide-angle end state, and in the wide-angle end state.
  • variable magnification optical system of the present embodiment satisfies the following conditional expression (2).
  • f1 Focal length of the first lens group
  • ff Focal length of the focusing group
  • Conditional expression (2) defines the ratio between the focal length of the first lens group and the focal length of the focusing group.
  • the variable magnification optical system of the present embodiment can suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to a near object.
  • the corresponding value of the conditional expression (2) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the focusing group increases, and spherical aberrations and the like start when focusing from an object at infinity to a near object. It becomes difficult to suppress fluctuations in various aberrations.
  • the upper limit of conditional expression (2) it is preferable to set the upper limit of conditional expression (2) to 2.25.
  • the corresponding value of the conditional expression (2) of the variable magnification optical system of the present embodiment is below the lower limit value, the refractive power of the first lens unit increases, and various aberrations including spherical aberration can be corrected. It becomes difficult.
  • the zoom optical system according to the present embodiment it is desirable that the first lens unit moves toward the object side when zooming from the wide-angle end state to the telephoto end state.
  • the overall length of the variable magnification optical system according to the present embodiment can be shortened in the wide-angle end state, and the variable magnification optical system according to the present embodiment can be reduced in size.
  • the distance between the focusing group and the image side group is increased when zooming from the wide-angle end state to the telephoto end state.
  • various aberrations can be corrected well during zooming. In particular, since a sufficient movement space for focusing the focusing group can be secured in the telephoto end state, spherical aberration can be favorably corrected when focusing on a short-distance object in the telephoto end state.
  • variable magnification optical system of the present embodiment satisfies the following conditional expression (3).
  • ff focal length of the focusing group
  • fi focal length of the image side group
  • Conditional expression (3) defines the ratio between the focal length of the focusing group and the focal length of the image side group.
  • the variable magnification optical system of the present embodiment can suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to a near object.
  • the corresponding value of the conditional expression (3) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the image side group increases, and it becomes difficult to correct various aberrations including coma. End up.
  • conditional expression (3) it is preferable to set the upper limit of conditional expression (3) to 1.00.
  • the corresponding value of conditional expression (3) of the variable magnification optical system of the present embodiment is below the lower limit value, the refractive power of the focusing group increases, and spherical aberration occurs when focusing from an object at infinity to a near object. It becomes difficult to suppress fluctuations in various aberrations including the above.
  • variable magnification optical system of the present embodiment satisfies the following conditional expression (4). (4) 1.80 ⁇ fi / ( ⁇ fB) ⁇ 5.20
  • fi focal length of the image-side group
  • fB focal length of the B-th group
  • Conditional expression (4) defines the ratio between the focal length of the image side group and the focal length of the B group that is the image stabilizing group.
  • the variable magnification optical system of the present embodiment can effectively suppress deterioration of optical performance during image stabilization by satisfying conditional expression (4).
  • conditional expression (4) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the image stabilizing group increases, and the deterioration of the eccentric coma during the image stabilizing increases.
  • conditional expression (4) of the variable magnification optical system of the present embodiment is below the lower limit value, the refractive power of the image side group becomes large, and it is difficult to correct various aberrations including coma. Become.
  • the refractive power of the anti-vibration group decreases, and the amount of movement of the anti-vibration group during vibration isolation increases. For this reason, since the lens barrel which accommodates the variable magnification optical system of this embodiment will enlarge, it is unpreferable.
  • the first lens group has at least two positive lenses. With this configuration, spherical aberration and chromatic aberration can be effectively corrected.
  • the focusing group is composed of one lens component. With this configuration, the focusing group can be further reduced in size and weight.
  • the focusing group is composed of a single lens. With this configuration, the focusing group can be further reduced in weight.
  • the focusing group includes at least one positive lens and satisfies the following conditional expression (5).
  • (5) 58.00 ⁇ FP
  • ⁇ FP Abbe number in the d-line (wavelength 587.6 nm) of the positive lens included in the focusing group
  • Conditional expression (5) defines the Abbe number of the positive lens included in the focusing group.
  • the variable magnification optical system according to the present embodiment satisfies the conditional expression (5), and thus can suppress fluctuations in chromatic aberration during focusing from an object at infinity to an object at short distance.
  • the corresponding value of conditional expression (5) of the variable magnification optical system of the present embodiment is less than the lower limit value, the occurrence of chromatic aberration in the focusing group increases, and the chromatic aberration is reduced when focusing from an object at infinity to a close object. Fluctuation will increase.
  • variable magnification optical system of the present embodiment satisfies the following conditional expression (6).
  • (6) 0.15 ⁇ ff / ft ⁇ 0.30
  • ff focal length of the focusing group
  • ft focal length of the variable magnification optical system in the telephoto end state
  • Conditional expression (6) defines the ratio between the focal length of the focusing group and the focal length of the variable magnification optical system of the present embodiment in the telephoto end state.
  • the variable magnification optical system of the present embodiment can suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to a near object.
  • conditional expression (6) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the amount of movement of the focusing group during focusing from an object at infinity to a near object increases, and spherical aberration is reduced. It becomes difficult to suppress fluctuations of various aberrations including the first.
  • the upper limit of conditional expression (6) it is preferable to set the upper limit of conditional expression (6) to 0.28. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (6) to 0.26.
  • the refractive power of the focusing group increases, and spherical aberration occurs when focusing from an object at infinity to a near object. It becomes difficult to suppress fluctuations in various aberrations including the above.
  • the optical device includes the variable magnification optical system having the above-described configuration.
  • An imaging apparatus includes a variable magnification optical system having the above-described configuration and an imaging unit that captures an image formed by the variable magnification optical system. Accordingly, it is possible to realize an optical device and an imaging device that have good optical performance and reduce the weight of the focusing group in order to speed up the focusing operation.
  • a method of manufacturing a variable magnification optical system includes a first lens group having a positive refractive power arranged closest to the object side, and a negative refractive power arranged on the image side from the first lens group.
  • An intermediate group having a positive refractive power arranged on the image side from the intermediate group and moving at the time of focusing; and a positive refractive power arranged on the image side from the focusing group
  • zooming the image side group the distance between the first lens group and the intermediate group, the distance between the intermediate group and the focusing group, and the distance between the focusing group and the image side group change.
  • the image-side group satisfies the following conditional expression (1) with respect to the A-th group having positive refractive power and the A-th group in order from the object side, and negative refraction. It is comprised from the B group which has force, and the C group. As a result, it is possible to manufacture a variable power optical system having good optical performance and reducing the weight of the focusing group in order to speed up the focusing operation.
  • (1) 1.67 ⁇ fA / ( ⁇ fB) ⁇ 2.80
  • fA focal length of the A group
  • fB focal length of the B group
  • FIG. 1 is a sectional view of a variable magnification optical system according to the first example. 1 and FIG. 5, FIG. 9, FIG. 13, FIG. 17, FIG. 21, FIG. 25, and FIG. 29, which will be described later, indicate the time of zooming from the wide-angle end state (W) to the telephoto end state (T). The movement locus of each lens group is shown.
  • the variable magnification optical system according to the first example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
  • the B group G4B is composed of, in order from the object, a cemented negative lens of a biconvex positive lens L44 and a biconcave negative lens L45.
  • the C group G4C includes, in order from the object side, a biconvex positive lens L46 and a negative meniscus lens L47 with a concave surface facing the object side.
  • the zoom optical system In the zoom optical system according to the first example, during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
  • the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
  • the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
  • the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the variable magnification optical system in a lens in which the focal length of the entire lens system is f and the image stabilization coefficient (the ratio of the amount of image movement on the image plane I to the amount of movement of the image stabilization group during image stabilization) is K, the angle ⁇ In order to correct the rotation blur, the vibration isolation group may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K. Therefore, the variable magnification optical system according to the first example has a vibration proof coefficient of 1.06 and a focal length of 71.40 (mm) in the wide-angle end state, and therefore corrects rotational blur of 0.30 °.
  • the amount of movement of the B group G4B is 0.35 (mm). In the telephoto end state, since the image stabilization coefficient is 1.86 and the focal length is 294.00 (mm), the amount of movement of the B group G4B for correcting the rotation blur of 0.20 ° is 0. 55 (mm).
  • Table 1 below lists values of specifications of the variable magnification optical system according to the first example.
  • f indicates the focal length
  • BF indicates the back focus (the distance on the optical axis between the lens surface closest to the image side and the image plane I).
  • the surface number is the order of the optical surfaces counted from the object side
  • r is the radius of curvature
  • d is the surface interval (the interval between the nth surface (n is an integer) and the n + 1th surface)
  • nd is The refractive index for d-line (wavelength 587.6 nm) and ⁇ d indicate the Abbe number for d-line (wavelength 587.6 nm), respectively.
  • the object plane indicates the object plane
  • the variable indicates the variable plane spacing
  • the stop S indicates the aperture stop S
  • the image plane indicates the image plane I.
  • the radius of curvature r ⁇ indicates a plane.
  • the description of the refractive index of air nd 1.0000 is omitted.
  • FNO is the F number
  • 2 ⁇ is the angle of view (unit is “°”)
  • Ymax is the maximum image height
  • TL is the total length of the variable magnification optical system according to the first example (from the first surface to the image surface) (Distance on the optical axis to I)
  • dn indicates a variable distance between the nth surface and the (n + 1) th surface.
  • W is the wide-angle end state
  • M is the intermediate focal length state
  • T is the telephoto end state
  • infinity is when focusing on an object at infinity
  • short distance indicates when focusing on a near object.
  • [Lens Group Data] indicates the start surface and focal length of each lens group.
  • [Conditional Expression Corresponding Value] the corresponding value of each conditional expression of the variable magnification optical system according to the first example is shown.
  • the focal length f, the radius of curvature r, and other length units listed in Table 1 are generally “mm”.
  • the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced.
  • symbol of Table 1 described above shall be similarly used also in the table
  • FIGS. 2A, 2B, and 2C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example.
  • 3A and 3B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the first example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • 4A, 4B, and 4C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example.
  • FNO represents the F number
  • Y represents the image height
  • NA represents the numerical aperture
  • the spherical aberration diagram shows the value of the F number FNO or the numerical aperture NA corresponding to the maximum aperture
  • the astigmatism diagram and the distortion diagram show the maximum value of the image height Y
  • the coma aberration diagram shows each image height. Indicates the value of.
  • d indicates the aberration at the d-line (wavelength 587.6 nm)
  • g indicates the aberration at the g-line (wavelength 435.8 nm).
  • the solid line indicates the sagittal image plane
  • the broken line indicates the meridional image plane.
  • the coma aberration diagram shows coma aberration at each image height Y. Note that the same reference numerals as those in the first embodiment are used in the aberration diagrams of the respective embodiments described later.
  • variable magnification optical system according to the first example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • FIG. 5 is a sectional view of a variable magnification optical system according to the second example.
  • the variable magnification optical system according to the second example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
  • the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
  • the C group G4C includes, in order from the object side, a biconvex positive lens L45 and a negative meniscus lens L46 having a concave surface directed toward the object side.
  • the zoom optical system according to the second example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
  • the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
  • the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
  • the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the variable magnification optical system according to the second example has a vibration isolation coefficient of 1.17 and a focal length of 71.35 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.32 (mm).
  • FIGS. 6A, 6B, and 6C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second example.
  • 7A and 7B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the second example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • FIGS. 8A, 8B, and 8C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the second example.
  • variable magnification optical system according to the second example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • FIG. 9 is a sectional view of a variable magnification optical system according to the third example.
  • the variable magnification optical system according to the third example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
  • the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
  • the C group G4C includes, in order from the object side, a biconvex positive lens L45, and a cemented negative lens of a biconcave negative lens L46 and a biconvex positive lens L47.
  • the zoom optical system according to the third example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2, and the second lens group G2
  • the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
  • the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
  • the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the variable magnification optical system according to the third example has the image stabilization coefficient of 1.22 and the focal length of 71.40 (mm) in the wide-angle end state, the rotation blur of 0.30 ° is corrected. Therefore, the movement amount of the B-th group G4B is 0.31 (mm).
  • FIGS. 10A, 10B, and 10C are graphs showing various aberrations during focusing of an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example.
  • 11A and 11B respectively show meridional lateral aberrations when a vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the third example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • 12A, 12B, and 12C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example.
  • variable magnification optical system according to the third example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • FIG. 13 is a sectional view of a variable magnification optical system according to the fourth example.
  • the zoom optical system according to the fourth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
  • the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
  • the C group G4C includes, in order from the object side, a biconvex positive lens L45, and a cemented negative lens of a biconcave negative lens L46 and a biconvex positive lens L47.
  • the zoom optical system according to the fourth example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
  • the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
  • the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a short-distance object.
  • the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the zoom optical system according to the fourth example since the zoom optical system according to the fourth example has the image stabilization coefficient of 1.21 and the focal length of 71.40 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.31 (mm).
  • FIGS. 14A, 14B, and 14C are graphs showing various aberrations when the object at infinity is focused in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom optical system according to the fourth example.
  • 15A and 15B respectively show meridional transverse aberrations when vibration is prevented against 0.30 ° rotation blur when an infinite object is focused in the wide-angle end state of the variable magnification optical system according to the fourth example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • 16A, 16B, and 16C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively, of the zoom optical system according to the fourth example.
  • variable magnification optical system according to the fourth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • FIG. 17 is a sectional view of a variable magnification optical system according to the fifth example.
  • the variable magnification optical system according to the fifth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
  • the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
  • the C group G4C includes, in order from the object side, a cemented positive lens of a biconvex positive lens L45 and a negative meniscus lens L46 having a concave surface facing the object side, and a negative meniscus lens L47 having a concave surface facing the object side.
  • variable magnification optical system the distance between the first lens group G1 and the second lens group G2 and the second lens group G2 and the second lens group G2 are varied at the time of zooming between the wide-angle end state and the telephoto end state.
  • the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
  • the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
  • variable magnification optical system image stabilization is performed by moving the B group G4B as the image stabilization group so as to include a component in a direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the variable magnification optical system according to the fifth example has an anti-vibration coefficient of 1.61 and a focal length of 72.10 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.23 (mm).
  • FIGS. 18A, 18B, and 18C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example.
  • 19A and 19B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the fifth example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • 20A, 20B, and 20C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example.
  • variable magnification optical system according to the fifth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • FIG. 21 is a sectional view of a variable magnification optical system according to the sixth example.
  • the zoom optical system according to the sixth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
  • the B group G4B is composed of a cemented negative lens composed of a negative meniscus lens L44 having a concave surface directed toward the object side and a biconcave negative lens L45 in order from the object side.
  • the C group G4C includes, in order from the object side, a biconvex positive lens L46 and a negative meniscus lens L47 with a concave surface facing the object side.
  • the zoom optical system according to the sixth example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
  • the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
  • the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
  • the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the zoom optical system according to the sixth example since the zoom optical system according to the sixth example has a vibration isolation coefficient of 1.54 and a focal length of 72.10 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.25 (mm).
  • FIGS. 22A, 22B, and 22C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example.
  • FIG. 23A and FIG. 23B are respectively meridional transverse aberrations when performing vibration isolation against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the zoom optical system according to the sixth example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • FIGS. 24A, 24B, and 24C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom optical system according to the sixth example.
  • variable magnification optical system according to the sixth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • FIG. 25 is a sectional view of the variable magnification optical system according to the seventh example.
  • the variable magnification optical system according to the seventh example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
  • the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L44 having a concave surface directed toward the object side and a biconcave negative lens L45 in order from the object side.
  • the C group G4C includes, in order from the object side, a biconvex positive lens L46 and a negative meniscus lens L47 with a concave surface facing the object side.
  • the zoom optical system according to the seventh example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2, and the second lens group G2
  • the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
  • focusing is performed from an object at infinity to a short-distance object by moving the third lens group G3 as the focusing group to the image side along the optical axis.
  • the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the variable magnification optical system according to the seventh example has an anti-vibration coefficient of 1.61 and a focal length of 72.10 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.23 (mm).
  • FIGS. 26A, 26B, and 26C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh example.
  • FIGS. 27A and 27B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the seventh example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • FIGS. 28A, 28B, and 28C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom optical system according to the seventh example.
  • variable magnification optical system according to the seventh example has excellent imaging performance by correcting various aberrations well from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • FIG. 29 is a sectional view of a variable magnification optical system according to the eighth example.
  • the variable magnification optical system according to the eighth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens having a positive refractive power. It consists of a group GR.
  • the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, and a fifth lens group G5 having a negative refractive power. Has been.
  • the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
  • the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
  • An aperture stop S is disposed between the A group G4A and the B group G4B.
  • the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
  • the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L44 having a concave surface directed toward the object side and a biconcave negative lens L45 in order from the object side.
  • the C group G4C includes a biconvex positive lens L46.
  • the fifth lens group G5 includes a negative meniscus lens L51 having a concave surface directed toward the object side.
  • the zoom optical system according to the eighth example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
  • the first to fifth lens groups so that the distance between the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5 change.
  • G1 to G5 move along the optical axis.
  • focusing is performed from an object at infinity to a short-distance object by moving the third lens group G3 as the focusing group toward the image side along the optical axis.
  • the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
  • the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
  • the variable magnification optical system according to the eighth example has the image stabilization coefficient of 1.62 and the focal length of 72.10 (mm) in the wide-angle end state, the rotation blur of 0.30 ° is corrected. Therefore, the movement amount of the B-th group G4B is 0.23 (mm).
  • FIGS. 30A, 30B, and 30C are graphs showing various aberrations during focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth example.
  • FIG. 31A and FIG. 31B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the eighth example.
  • FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
  • 32A, 32B, and 32C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth example.
  • variable magnification optical system according to the eighth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
  • variable magnification optical system in which the focusing group is reduced in size and weight.
  • This variable power optical system allows the focusing group to be driven by a small motor or mechanical mechanism by reducing the size and weight of the focusing group, so that the focusing operation can be performed quickly and silently without increasing the size of the lens barrel. Can be achieved.
  • each said Example has shown one specific example of this invention, and this invention is not limited to these.
  • the following contents can be adopted as appropriate as long as the optical performance of the variable magnification optical system of the present embodiment is not impaired.
  • variable magnification optical system of the present embodiment a four-group or five-group configuration is shown, but the present application is not limited to this, and a variable-magnification optical system having other group configurations (for example, six groups) is configured.
  • the second lens group is shown as an intermediate group having a negative refractive power disposed on the image side from the first lens group, but this is not restrictive.
  • the third lens group is shown as the focusing group having positive refractive power disposed on the image side from the second lens group as the intermediate group, but this is not restrictive.
  • the fourth lens group is shown as the image side group having a positive refractive power disposed on the image side from the focusing group, but this is not restrictive.
  • a lens group having a positive or negative refractive power is disposed between the first lens group and the intermediate group (second lens group), and the distance between the lens groups may change during zooming. Good.
  • a lens group having positive or negative refractive power is disposed between the intermediate group (second lens group) and the focusing group (third lens group), and the distance between the lens groups changes during zooming. It is good. Further, a lens group having a positive or negative refractive power is disposed between the focusing group (third lens group) and the image side group (fourth lens group), and the distance between the lens groups changes during zooming. It is good as well.
  • variable magnification optical system it is preferable to dispose the image stabilizing group on the image side from the focusing group, and it is more preferable to arrange another lens between the focusing group and the image stabilizing group.
  • another lens when another lens is disposed between the focusing group and the image stabilization group, the air distance between the lens facing the object side of the image stabilization group and the image stabilization group is the air distance between the subsequent groups. Of these, it is preferable to have the largest air spacing.
  • the subsequent group it is preferable to arrange an aperture stop between the focusing group and the image stabilization group, and it is more preferable to arrange the aperture stop at a position facing the object side of the image stabilization group.
  • the refractive power of the C group is positive in each embodiment, but may be negative.
  • the sub-combination of the feature group of each embodiment can also be an invention.
  • the entire third lens group is set as the focusing group, but a part of the lens group or a plurality of lens groups may be set as the focusing group. Further, it is preferable that the focusing group has a positive refractive power. Further, the focusing group only needs to be composed of one or two lens components, and a configuration composed of one lens component is more preferable. Such a focusing group can also be applied to autofocus, and is also suitable for driving by an autofocus motor such as an ultrasonic motor, a stepping motor, or a VCM motor.
  • an autofocus motor such as an ultrasonic motor, a stepping motor, or a VCM motor.
  • variable magnification optical system of each of the above embodiments either the entire lens unit or a part of the lens unit is moved so as to include a component in a direction perpendicular to the optical axis as an anti-vibration group, or the optical axis is changed. It can also be set as the structure which shake-proofs by carrying out rotational movement (oscillation) to the in-plane direction including.
  • the B group is a vibration proof group.
  • the anti-vibration group may be composed of one cemented lens as in the above embodiments, but the number of lenses is not particularly limited, and may be composed of a single lens or a plurality of lens components. Good. Moreover, it is preferable that the vibration isolating group has a negative refractive power.
  • the image stabilizing group is preferably configured by a part of one lens group, and more preferably configured by a central part obtained by dividing one lens group into three parts. Further, it is preferable that the image stabilizing group is composed of a central negative part by dividing one lens group into three parts, positive, negative, positive and negative.
  • the lens surface of the lens constituting the variable magnification optical system of each of the above embodiments may be a spherical surface, a flat surface, or an aspherical surface.
  • Each lens may be formed of a glass material, a resin material, or a composite of a glass material and a resin material.
  • the lens surface is a spherical surface or a flat surface, it is preferable because lens processing and assembly adjustment are easy, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance.
  • the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good.
  • the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
  • GRIN lens gradient index lens
  • an antireflection film may be provided on the lens surface of the lens constituting the variable magnification optical system of each of the above embodiments.
  • flare and ghost can be reduced, and high optical performance with high contrast can be achieved.
  • FIG. 33 is a diagram showing a configuration of a camera provided with the variable magnification optical system of the present embodiment.
  • the camera 1 is a so-called mirrorless camera of an interchangeable lens provided with the variable magnification optical system according to the first example as the photographing lens 2.
  • the camera 1 In the camera 1, light from an object (subject) (not shown) is collected by the photographing lens 2 and is on the imaging surface of the imaging unit 3 via an OLPF (Optical low pass filter) (not shown). A subject image is formed on the screen. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thus, the photographer can observe the subject via the EVF 4. When the release button (not shown) is pressed by the photographer, the subject image generated by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.
  • OLPF Optical low pass filter
  • variable magnification optical system according to the first embodiment mounted on the camera 1 as the photographing lens 2 has good optical performance as described above, and the focusing group is reduced in weight. That is, the camera 1 can realize a high speed focusing operation and good optical performance. Even if a camera equipped with the variable magnification optical system according to the second to eighth examples as the taking lens 2 is configured, the same effect as the camera 1 can be obtained. Further, even when the variable magnification optical system according to each of the above embodiments is mounted on a single-lens reflex camera that has a quick return mirror and observes a subject with a finder optical system, the same effect as the camera 1 can be obtained. it can.
  • FIG. 34 is a diagram showing an outline of a manufacturing method of the variable magnification optical system of the present embodiment.
  • the manufacturing method of the variable magnification optical system of the present embodiment shown in FIG. 34 includes a first lens group having a positive refractive power arranged closest to the object side, and a negative lens arranged closer to the image side than the first lens group.
  • An intermediate group having a refractive power, a focusing group having a positive refractive power arranged on the image side from the intermediate group and moving during focusing, and a positive refractive power arranged on the image side from the focusing group And an interval between the first lens group and the intermediate group when zooming the first lens group, the intermediate group, the focusing group, and the image side group.
  • fA focal length of the A group
  • fB focal length of the B group
  • variable magnification optical system having good optical performance and reducing the weight of the focusing group for speeding up the focusing operation is manufactured. Can do.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
  • Adjustment Of Camera Lenses (AREA)

Abstract

L'invention comprend un premier groupe positif G1 qui est disposé le plus loin d'un côté objet, un groupe intermédiaire négatif G2 qui est disposé plus loin d'un côté image que le premier groupe G1, un groupe positif de mise au point G3 qui est disposé plus loin du côté image que le groupe intermédiaire G2 et qui se déplace pendant la mise au point, et un groupe positif du côté image G4 qui est disposé plus loin du côté image que le groupe de mise au point G3, l'espace compris entre le premier groupe G1 et le groupe intermédiaire G2, l'espace compris entre le groupe intermédiaire G2 et le groupe de mise au point G3, et l'espace compris entre le groupe de mise au point G3 et le groupe du côté image G4 changeant lorsque l'agrandissement est modifié, et le groupe du côté image G4 comprenant, dans l'ordre à partir du côté objet, un groupe A positif G4A, un groupe B négatif G4B qui satisfait à une expression conditionnelle prescrite pour le groupe A G4A, et un groupe C G4C. Il est ainsi possible de pourvoir à un système optique à puissance variable qui est doté de bonnes performances optiques et qui permet d'obtenir une réduction du poids d'un groupe de mise au point en vue d'augmenter la vitesse de la mise au point.
PCT/JP2016/077469 2015-09-18 2016-09-16 Système optique à puissance variable, dispositif optique, dispositif d'imagerie, et procédé de production d'un système optique à puissance variable WO2017047757A1 (fr)

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JP2017540006A JP6705459B2 (ja) 2015-09-18 2016-09-16 変倍光学系、光学装置、撮像装置
CN201680060992.4A CN108139574B (zh) 2015-09-18 2016-09-16 变倍光学系统、光学装置以及摄像装置
EP16846628.2A EP3351987A4 (fr) 2015-09-18 2016-09-16 Système optique à puissance variable, dispositif optique, dispositif d'imagerie, et procédé de production d'un système optique à puissance variable
US15/759,829 US10725272B2 (en) 2015-09-18 2016-09-16 Variable magnification optical system, optical apparatus, imaging apparatus and method for manufacturing variable magnification optical system
US16/900,321 US11448860B2 (en) 2015-09-18 2020-06-12 Variable magnification optical system, optical apparatus, imaging apparatus and method for manufacturing variable magnification optical system

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JP2015-185502 2015-09-18

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US16/900,321 Division US11448860B2 (en) 2015-09-18 2020-06-12 Variable magnification optical system, optical apparatus, imaging apparatus and method for manufacturing variable magnification optical system

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CN108139574B (zh) 2020-05-26
EP3351987A4 (fr) 2019-05-22
JP6705459B2 (ja) 2020-06-03
CN108139574A (zh) 2018-06-08
US20200310087A1 (en) 2020-10-01
EP3351987A1 (fr) 2018-07-25
US20180259751A1 (en) 2018-09-13
US10725272B2 (en) 2020-07-28
JPWO2017047757A1 (ja) 2018-07-05
US11448860B2 (en) 2022-09-20

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